Apparatus of driving spindle for false twisting yarn

ABSTRACT

Apparatus for driving a spinner for the false twisting of yarn. The apparatus includes a spindle driving device delivering rotation of a driving roller to a spinnner while it is attracted to the outer periphery of the driving roller with magnet force of a rare earth, samarium cobalt magnet, said magnet being located at a place spaced from the outer periphery of the driving roller. A pair of magnet pole plates, one above the other, fixed to the upper and lower poles of said magnet respectively and extending to embrace the drive roller with gaps above and below the drive roller. Each magnet pole plate has a projection protruding in a direction from the center of the driving roller to the spinner, with said projection, the spinner is pressed against the driving roller.

United States Patent Kodaira et al.

[451 July 15, 1975 APPARATUS OF DRIVING SPINDLE FOR FALSE TWISTING YARN [76] Inventors: Nobuhisa Kodaira, l-l-lO Shoan Suginamiku; Norio Motegi, 1-2-8 Sakura Setagaya-ku, both of Tokyo-to, Japan [22] Filed: Mar. 11, 1974 [21] Appl. No.: 449,624

[52] US. Cl 57/77.45; 57/77.45 [51] Int. Cl D0lh 7/92 [58} Field of Search 57/77.377.45. 57/156 [56] References Cited UNITED STATES PATENTS 3,308,614 3/1967 Stahlecker 57/77.45 3 355 871 12/1967 Mattingly 1 t l 57/77145 3.578.751 5/1971 Kodaira et al. 57/77.45 3,735,262 5/1973 Orth v 57/77.45 X 3,748 842 7/1973 Kodaira et al. 57/77.45

Primary E.ruminerDonald E. Watkins Attorney, Agent, or FirmPrice, Heneveld, Huizenga & Cooper [57] ABSTRACT Apparatus for driving a spinner for the false twisting of yarn. The apparatus includes a spindle driving device delivering rotation of a driving roller to a spinnner while it is attracted to the outer periphery of the driving roller with magnet force of a rare earth. samarium cobalt magnet, said magnet being located at a place spaced from the outer periphery of the driving roller. A pair of magnet pole plates, one above the other, fixed to the upper and lower poles of said magnet respectively and extending to embrace the drive roller with gaps above and below the drive roller. Each magnet pole plate has a projection protruding in a direction from the center of the driving roller to the spinner, with said projection, the spinner is pressed against the driving roller.

7 Claims, 6 Drawing Figures APPARATUS OF DRIVING SPINDLE FOR FALSE TWISTING YARN This invention relates to apparatus for driving a spinner for the false twisting of synthetic yarn by delivering high speed rotation to the spinner. More in detail, the spinner is attracted by magnet means mounted on a standard for a driving roller and the spinner is pressed to the outer periphery of the driving roller and rotated with high speed.

Many devices of this kind are known and are provided with an Alnico magnet (alloy of aluminum, cobalt and nickel) or a ferrite magnet (barium ferrites, strontium ferrite) as a result of which their structure is complicated and large in size. This causes difficulty in handling and adjustment in mounting it on a driving roller standard.

When an Alnico magnet is used, its residual magnetic flux density in the second quadrant of the BH curve amounts to 8,000 to 12,000 gauss, its coercive force is about 500 to 700 oersteds, and its reversible magnetic inductive rate approximates 4. Therefore, it is usual to give the magnet a horseshoe shape so that its crosssectional area is decreased. As an example, two horseshoe magnets can be arranged in parallel, each having a 1.4 cm cross-sectional area and a cm. length and can be, at each of its ends, provided with a magnet pole to guide two magnets. These magnets thus have to be placed at the upper and lower circumferences of the associated roller. This makes the structure very complicated and of high cost. Also, this makes it difficult to adjust the vertical alignment of the ends of the magnetic poles and maintain a gap between the magnet and the spinner.

Also, when a ferrite magnet is used, its residual magnetic flux density in the second quadrant of the BH curve is about 2,000 to 4,000 gauss, its coersive force is about 1,800 to 2,200 oersteads, and its reversible magnetic inductive ratio is about 1.2 to 2 so that its cross-sectional area must be comparatively larger and its length between the poles too should be comparatively larger. However, compared with Alnico magnet, its shape is flatter and its length is a fraction of that of an Alnico magnet. This magnet may be, for example, placed in an annular groove formed between the outer circumference of spinner driving rollers and the associated shaft. However, unless its length is larger than the thickness of the roller, effective results cannot be obtained. There is also difficulty in supporting the magnets and in maintaining the vertical alignment of the ends of the magnet poles and a gap between the magnet and the spinner. Moreover, the cost of the magnet itself may be cheaper, but the arrangement costs more as a whole. As an example, there may be considered a ringshaped magnet which is 4 cm. in outer diameter and 2 cm. in inner diameter and 3 cm. in height. This ringshaped magnet is placed in an annular groove of a driving roller. When the core metal of the drive roller is made with electrically conductive aluminum discs, for reducing its weight, which rotation of the roller surrounding the magnet at high speed, cause turbulent eddy currents to flow in the discs which act as a brake on the driving motor. This brake absorbs about 0.3 to 0.4 of the rotational energy of the roller which is a great loss to the efficiency of the apparatus. Alternatively, it necessitates the use of a drive roller requiring 1.3 to 1.4 times the power for normal driving. This may also be true of the Alnico magnet which, though power loss is small, results in unbalanced movement of the roller.

One object of the present invention is to provide improved apparatus for driving a spinner for the false twisting of synthetic yarn in which the magnet is of more compact size than the conventional one and of low cost.

Another object of the present invention is to provide an improved spinner driving apparatus and, with respect to mounting said magnet on a standard for the driving roller, the invention makes it easy to adjust the vertical alignment between the ends of opposite magnet poles, and to adjust the gap between these ends and the spinner and also the gap between said ends and the outer periphery of the driving roller.

A further object of the present invention is to provide means to prevent eddy current flow in the driving roller and to prevent the driving roller from assuming an unbalanced movement.

To achieve these objects in the present invention, it was found that a rare earth, samarium cobalt is most suitable for use as a magnet.

Due to a remarkable improvement in magnet alloys an alloy magnet in which an atomic proportion of a rare earth element to cobalt of 1:5 and having high residual magnetic flux density and coersive force and containing maximum energy, has been found. Of these, the most suitable is samarium cobalt (SmCo or cerium cobalt (Ceco having a large magnetic anisotropy field and a high Curie temperature. Samarium cobalt magnet is a very strong magnet having a maximum value of physical property which is about 9,000 gauss in residual magnetic flux density and 9,000 oersteds of coersive force, the maximum energy product being 20 mega-gauss-oersted or more. lts reversible permeable rate approximates l and, in the second quadrant of its BH curve, its lines are straight rather than curved. When this magnet is used in said spinner driving apparatus, its length may be a tenth of that of an Alnico magnet and its cross-sectional area may be a fraction of that of a ferrite magnet. It is not demagnetized by external magnetic disturbances, and may be of sufficient strength with a smaller size. This enables the use of a very small cylinder or rectangular shaped magnet having a small pole at each of its opposite ends. Thus, the apparatus may be compact in size and capable of very easy adjustment at the time of mounting.

Besides this samarium magnet, there is a white gold cobalt magnet, but this is less efficient than said samarium magnet and is far more expensive to put into practical use.

Considering its lightweight as well as its simple structure and easy mounting, despite the fact that the magnet itself is somewhat higher in cost, it is ultimately far cheaper, considered as a whole. To produce the same effect as known apparatus, it is sufficient to use a magnet having a 1 cm cross-sectional area and about a 1 cm length. Thus, the magnet means necessary to support spinner can be made in extremely compact size and placed in a narrow space in front of the spinner of driving roller.

In this kind of apparatus, it is already known to use a magnet means fixed between a pair of drive discs. However, with the device of the present invention, the length of the spinner may be short, and moreover the span of the fulcrum support provided by the magnet means may be large. Thus, the spinner is supported in a stable condition.

The present invention will become more apparent as the description proceeds with reference to the accompanying drawings in which:

FIG. I is a sectional view of one embodiment of the present invention;

FIG. 2 is a plan view of the above;

FIG. 3 is a sectional view of a spinner supporting means, a part of which has been modified from the above;

FIG. 4 is a front view of another embodiment;

FIG. 5 is a plan view of the embodiment shown in FIG. 4; and

FIG. 6 is a plan view in which a plurality of spinner supporting means are provided.

Referring now to FIGS. 1 and 2, numeral 1 indicates a standard for securely supporting a driving roller bearing 2. 3 is a nut secured to the bearing 2. 4 is a spindle. 5 is a disc-like driving roller secured to the top end of the spindle 4. 6 is a tubular spinner having in its center an axial bore. The spinner is rotated at high speed by being in driving contact with the outer periphery of the driving roller 5. At one end of the spinner, a sapphire pin is provided to facilitate the twisting of yarn. Between its ends, the spinner 6 has a circumferential flange 16 which seats in a circumferential channel 17 in the periphery of the driving roller 5.

7 is a small size, oblong-shaped magnet of samarium cobalt. At its upper and lower poles, a pair of ringshaped, high permeable magnet pole plates 8, 9 made of thin iron are fixed respectively. Said upper andlower magnet plates are each fixed to said magnet at one end while their other ends, remote from the magnet, are so placed that between the'two magnet pole plates; the outer periphery of the driving roller 5 is positioned with a slight gap relative to the upper and lower magnet pole plates respectively. At the side near the roller 5, each ring shape pole plate 8, 9 has, at its inside, a small projection 10 (FIG. 2). Each of the upper and lower magnet pole plates 8, 9 is so mounted with studs 11 to the standard I that said projection It) is positioned to be radially inward a short distance (indicated at AR in FIG. 5) from the outer periphery of the roller 5. The spinner 6 is held at the point end of the projection 10. To maintain an inductive force in the range of 500 to 600 grams to press the spinner 6 to the periphery of the roller 5 with a gap 0.3 mm between the spinner 6 and projection 10, a magnet flux density will be required in the range of 15,000 gauss. With a samarium cobalt magnet the crosssectional area of the magnet will be sufficient as small as 1 cm and with a length of about 1 cm. 12 is a bushing secured to the lower portion of spindle 4 and is rotatable by a high speed belt 13.-

In FIG. 3, there is shown another embodiment in which ring shape magnet pole plates 3, 9 as in FIG. 2 are provided, but these are curved or offset, one upwardly and the other downwardly so that the spinner 6 may be easily mounted from the side.

In FIGS. 4 and 5, instead of ring shape magnet pole plates, curved, tongue-shaped magnet pole plates l4, 15, each one-fourth of a ring or circle, are provided. FIG. 4 illustrates this in front elevation view and FIG. 5 illustrates this in plan view. Similar to that shown in FIG. 1, the tongue-shaped, thin, iron plates 14, 15 are tight to the upper and lower poles faces of magnet 7. Thus, the outer periphery of the driving rollers 5 is inserted between their ends with a slight gap above and below the roller. The tongue shape plates are so mounted to the standard that each small projection 16 is positioned to bea slight distance AR radially inward of the outer periphery of the drive roller.

In FIG. 6, two'spinner supporters similar to that illustrated in FIG. 5 are provided on opposite sides of a single driving roller 5, thus, the small size spinner supporters may be provided. Thus, with small size spinner supporters, one or more spinners 16 may be rotated simultaneously, thereby the apparatus is simplified with low cost. Same will be true with respect to the supporter in FIG. 1.

The embodiments of the invention in which an exclu sive property or privilege is claimed are defined as follows:

1. Apparatus for driving the spinner for false-twisting yarn, said apparatus having a driven disc-like roller mounted for rotation about a vertical axis and a spinner and a magnet for magnetically holding said spinner against the periphery of said roller, said spinner being an elongated tube with its ends projecting above and below said roller, the improvement in said apparatus comprising: said magnet being mounted adjacent to but spaced from the periphery of said roller and having an upper pole and a lower pole; a pair of arms, one secured to said upper pole and the other to said lower pole, portions of said arms extending over and under said roller, respectively, and each having a projection thereon positioned closely to but spaced from said spinner for holding said spinner in a circumferentially fixed I position with respect to said roller whereby rotation of said roller will rotate said spinner; said magnet and said spinner both being on the same side of the axis of said roller and each of said arms being generally curvilinear and passing between said spinner and said axis of said roller and said projections extending toward said spinner.

2. The apparatus of claim 1 wherein each of said arms is generally circular and passes around said spinner and said projection extends inwardly thereof toward said spinner.

3. The apparatus of claim ll wherein said arms have the general shape of a quarter circle and said projections are on the ends thereof.

4. The apparatus of claim 1 wherein the spacing between said projections and said spinner is approxiin driving engagement with the periphery of said roller,

said magnetic means comprising: a magnet body having its poles arranged at opposite ends of an axis parallel to the axis of rotation of said roller; said magnet body being mounted at a point spaced outwardly from the peripheryof said roller; an arm mounted on each of the opposite ends of said magnetic body; said arms being spaced apart, and overlying and spaced from said roller, one adjacent each side of said roller; said arms each ieing annular in shape and having an inwardly extendprojection for positioning said spinner.

The apparatus of claim 5 wherein said magnet has a cross-sectional area of approximately I em and a height of 1 cm and a magnet flux density of approximately I5 ,000 I gauss.

to overlie and receive said roller therebetween, said roller being spaced from both of said pole plates; said pole plates being circular and generally annular and each having a projection extending in a direction away from the center of said roller and toward said magnet, the ends of said spinner being seated against the periphery of said roller adjacent said projections. 

1. Apparatus for driving the spinner for false-twisting yarn, said apparatus having a driven disc-like roller mounted for rotation about a vertical axis and a spinner and a magnet for magnetically holding said spinner against the periphery of said roller, said spinner being an elongated tube with its ends projecting above and below said roller, the improvement in said apparatus comprising: said magnet being mounted adjacent to but spaced from the periphery of said roller and having an upper pole and a lower pole; a pair of arms, one secured to said upper pole and the other to said lower pole, portions of said arms extending over and under said roller, respectively, and each having a projection thereon positioned closely to but spaced from said spinner for holding said spinner in a circumferentially fixed position with respect to said roller whereby rotation of said roller will rotate said spinner; said magnet and said spinner both being on the same side of the axis of said roller and each of said arms being generally curvilinear and passing between said spinner and said axis of said roller and said projections extending toward said spinner.
 2. The apparatus of claim 1 wherein each of said arms is generally circular and passes around said spinner and said projection extends inwardly thereof toward said spinner.
 3. The apparatus of claim 1 wherein said arms have the general shape of a quarter circle and said projections are on the ends thereof.
 4. The apparatus of claim 1 wherein the spacing between said projections and said spinner is approximately 0.3mm.
 5. A driving spindle for false-twisting yarn apparatus, said apparatus having a disc-like driving roller and a tubular spinner, magnetic means for holding said spinner in driving engagement with the periphery of said roller, said magnetic means comprising: a magnet body having its poles arranged at opposite ends of an axis parallel to the axis of rotation of said roller; said magnet body being mounted at a point spaced outwardly from the periphery of said roller; an arm mounted on each of the opposite ends of said magnetic body; said arms being spaced apart, and overlying and spaced from said roller, one adjacent each side of said roller; said arms each being annular in shape and having an inwardly extending projection for positioning said spinner.
 6. The apparatus of claim 5 wherein said magnet has a cross-sectional area of approximately 1 cm2 and a height of 1 cm and a magnet flux density of approximately 15,000 gauss.
 7. A driving spindle for false twisting yarn apparatus, said apparatus having a disc-like driving roller and a spinner and magnet means for pressing the spinner against the outer periphery of said roller, said magnet means comprising: a support mounting said magnet at a point spaced outwardly from the periphery of said roller; a pair of magnet pole plates one attached to each end of said magnet; said pole plates being spaced apart to overlie and receive said roller therebetween, said roller being spaced from both of said pole plates; said pole plates being circular and generally annular and each having a projection extending in a direction away from the center of said roller and toward said magnet, the ends of said spinner being seated against the periphery of said roller adjacent said projections. 